642696 has 32 divisors (see below), whose sum is σ = 1636800. Its totient is φ = 210240.

The previous prime is 642683. The next prime is 642701. The reversal of 642696 is 696246.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642696.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1245 + ... + 1683.

It is an arithmetic number, because the mean of its divisors is an integer number (51150).

2⁶⁴²⁶⁹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (818400).

642696 is an abundant number, since it is smaller than the sum of its proper divisors (994104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642696 is a wasteful number, since it uses less digits than its factorization.

642696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509 (or 505 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 642696 is about 801.6832292121. The cubic root of 642696 is about 86.2982254983.

The spelling of 642696 in words is "six hundred forty-two thousand, six hundred ninety-six".